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Women at increasing risk of kidney stones, related ER visits

DETROIT -- The risk of women developing kidney stones is rising, as is the number of cases being seen in U.S. emergency departments, while the rate of hospitalization for the disorder has remained stable.

Those are among the findings of a new study led by Henry Ford Hospital researchers that set out to look at trends in visits, hospitalization and charges during a four-year period for patients who went to U.S. hospital emergency departments for treatment of kidney stones.

"While the number of patients visiting the emergency department had increased over that time period, it was women who had the greatest increase in visits," says Khurshid R. Ghani, M.D., of Henry Ford's Vattikuti Urology Institute and lead author of the study.

The study is published online in the Journal of Urology.

Citing recent population-based studies that have shown an increase in kidney stones among women, Dr. Ghani says his team's findings in the ER provide further evidence that the risk of stones in women appears to be increasing.

"Women are becoming more and more obese. Obesity is a major risk factor for developing a kidney stone. And one fascinating thing about women versus men is obese women are more likely to develop a stone than an obese man," says Dr. Ghani.

Drawing raw data from the Nationwide Emergency Department Sample (NEDS), the research team looked for related emergency room visits from 2006 2009. They found a total of more than 3.6 million visits for upper urinary tract stones.

During the study period, the incidence of the disorder rose from 289 to 306 per 100,000 people. Among the study group, 12 percent were hospitalized as a result of their visits and rates remained stable during the study period.

"I think in the last 10 years, the way urologists manage kidney stone patients in the ER has changed dramatically," says Dr. Ghani. "Today, the emergency room physician and urologist have access to better diagnostic tools that allow for a more precise diagnosis. We use a CT scan, which is a quick test that allows for an immediate diagnosis and is available in every emergency department.

"Better diagnosis may be contributing to our findings that patients are not being admitted to the hospital as frequently as they had in the past.

Also, medication can help with the spontaneous passage of these stones. As a result, some of these patients may be safely managed through the outpatient system with follow-up visits."

For those who do get admitted to the hospital, the study showed that the highest likelihood was related to sepsis, or blood infection, which can sometimes occur when the stone causes a blockage and urinary tract infection.

Most notably, in 2009, the charges for emergency department visits rose to $5 billion in 2009 from $3.8 billion dollars in 2006.

"One of the possible reasons for the increase in charges is the use of a CT scan to diagnose a kidney stone," Dr. Ghani says.

"Fifteen years ago, around 5-10 percent of patients visiting the emergency department for a kidney stone would get a CT scan. Today, 70 percent of patients who visit the emergency department get a scan. While they're wonderful tools of technology that allow an accurate diagnosis, they are expensive," says Dr. Ghani.


Contact: Dwight Angell
Henry Ford Health System

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